Improve "Use Round Tabs" Tip

- Remove outdated image
- Add link to the preference page

eclipse.platform.common/bundles/org.eclipse.platform.doc.user/tips/platform_tips.html

@@ -240,8 +240,10 @@ <h3><a name="Workbench" id="Workbench">Workbench</a></h3>
       <td width="80%" valign="top" align="left">
         Square tabs are used by default in the IDE:
         <p><img src="images/dark_theme_square_tabs.png" align="top" border="0" alt="Square tabs in dark theme"></p>
-        <p>In order to switch back to using round tabs, you can use the preference option:</p>
-        <p><img src="images/round_tabs_preference_option.png" alt="Use round tabs appearance preference"></p>
+        <p>In order to switch back to using round tabs, you can use the preference option <b>Use round tabs</b> on the 
+        <a class="command-link" href='javascript:executeCommand("org.eclipse.ui.window.preferences(preferencePageId=org.eclipse.ui.preferencePages.Views)")'>
+          <img src="PLUGINS_ROOT/org.eclipse.help/command_link.svg" alt="command link"><strong>General &gt; Appearance</strong>
+        </a> preferences page.</p> 
       </td>
     </tr>
     <tr>